SQL-DATABASE ERROR

Database error in WoltLab Burning Board: Invalid SQL: SELECT u.userid, u.username, u.invisible, u.receivepm, u.lastactivity, uf.* FROM bb1_users u, bb1_groups g LEFT JOIN bb1_userfields uf ON (u.userid=uf.userid) WHERE u.groupid = g.groupid AND g.ismod=1 ORDER BY u.username ASC
mysql error: Unknown column 'u.userid' in 'on clause'
mysql error number: 1054
Date: 23.06.2021 @ 20:26
Script: /forum/wbblite/team.php?sid=56abe82e2d00eedf8545f1a4a7ea22fb
Referer: